Texas researchers will begin clinical trials of a candidate vaccine against the deadly toxin ricin, a biological agent that can only be tested in select labs.University of Texas Southwestern Medical Center in Dallas received approval from the Food and Drug Administration to conduct the safety trial in humans. According to the Centers for Disease Control and Prevention, as little as 500 micrograms of ricin — about what fits on the head of a pin — is enough to kill an adult. Lethal doses depend on how the poison is delivered — by powder, mist, pellet or dissolved in water. The poison can be made from waste left over from processing castor beans.Full Story
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